arm64: dts: ti: k3-j7200: Add node to disable loopback connection

CTRLMMR_MCU_SPI1_CTRL register controls if MCU_SPI1 is directly
connected to SPI3 in the MAIN Domain (default) or if MCU_SPI1
and SPI3 are independently pinned out. By default, the field
SPI1_LINKDIS (Bit 0) is set to 0h. In order to disable the direct
connection, the SPI1_LINKDIS (Bit 0) needs to be set to 1h. Model
this functionality as a "reg-mux" device and based on the idle-state
property, enable/disable the connection bewtween MCU_SPI1 and MAIN_SPI3.

The register field description has been referred from J7200 TRM [1]
(Table 5-517. CTRLMMR_MCU_SPI1_CTRL Register Field Descriptions).

[1] https://www.ti.com/lit/pdf/spruiu1

Signed-off-by: Anurag Dutta <a-dutta@ti.com>
Link: https://lore.kernel.org/r/20241127075644.210759-1-a-dutta@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>

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