Remove HW CS SPI configuration from Device tree configuration

[vmanchala-dev]

Description

• Removed HW CS configuration in device tree and CS is configured from user space application
• Updated RESET pin.

Test

• Verified with MOSI test example and able to led toggling.

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Note

Disables hardware chip select on SPI1 in the BeagleBone device tree and shifts CS handling to userspace; aligns Elixir TFT code accordingly.

• Device tree (BB-SPIDEV1-00A0_zola.dts): comments out spi1_cs0 (P9.28) from exclusive-use, pinmux disable, and pinctrl entries; retains spi1 with spidev channels 1.0 and 1.1 enabled
• Elixir (tft_id.ex, tft_spi_ili9488.ex): updates reset GPIO to 74, parameterizes SPI device via @spi_device, switches to import Bitwise; TFTTest adds register reads and rotation set; Ili9488 removes old init path and uses new_init_display exclusively

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