Disable base SPI channel nodes for LCD and touch

[vmanchala-dev]

Description

• Disables the default channel@0 and channel@1 SPI child nodes created by the base AM335x device tree for both McSPI0 and McSPI1.
• The base device tree pre-defines SPI channel nodes (bounding to spidev) that automatically claim chip-selects during boot.
  When custom SPI devices (ILI9488 LCD and ADS7846 touch) are added via overlay, these default nodes causing below errors

chipselect already in use errors
SPI device registration failures
pinmux conflicts

We are explicitly sets status = "disabled" on the base SPI channel@* nodes using target-path.
This prevents the placeholder SPI devices from being created while keeping the SPI controllers enabled for custom drivers.

Test

After loading the driver on V2 following is the message

[   74.064307] [drm] Initialized ili9488 1.0.0 20221017 for spi1.0 on minor 0
[   75.149075] Console: switching to colour frame buffer device 40x30
[   75.401902] ili9488 spi1.0: [drm] fb0: ili9488drmfb frame buffer device
[   93.659405] ads7846 spi1.1: supply vcc not found, using dummy regulator
[   93.662159] ads7846 spi1.1: touchscreen, irq 68
[   93.669482] input: ADS7846 Touchscreen as /devices/platform/ocp/48000000.interconnect/48000000.interconnect:segment@100000/481a0000.target-module/481a0000.spi/spi_master/spi1/spi1.1/input/input0
iex(12)> 

With these changes we will do actual test on reworked board and verify.

---

Note

Medium Risk
Medium risk because it changes device-tree SPI topology/pinmux for both McSPI0 and McSPI1 and can break SPI peripherals or pin assignments if target paths or GPIO mappings are wrong.

Overview
Prevents SPI chip-select conflicts for the LCD+touch overlay. The overlay now explicitly disables the base AM335x channel@0/channel@1 SPI child nodes (for both McSPI0 and McSPI1) via target-path, instead of deleting nodes under &spi1, so custom ili9488 and ads7846 devices can bind cleanly.

Also updates pin/pinmux handling: disables an additional pinmux (P8_41_pinmux), changes the LCD reset pinmux and reset-gpios mapping to a new GPIO, and bumps VERSION to 2.27.2+zola-12k.

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Inconsistent indentation uses tabs instead of spaces

Low Severity

The new fragment@3 through fragment@6 (lines 103-135) use tab characters for indentation, while the rest of the file consistently uses 4-space indentation. This creates visual inconsistency and can cause confusing diffs when different editors auto-format the file differently. The file mixes two indentation styles in directly adjacent code blocks.