arm64: dts: ti: k3-am62-main: Fix clocks for McSPI

Fixes the clock Device ID's in the DT according to the tisci docs clock
identifiers for AM62x

Fixes: c37c58fd ("arm64: dts: ti: k3-am62: Add more peripheral nodes")
Reviewed-by: Bryan Brattlof <bb@ti.com>
Signed-off-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20230103054840.1133711-1-d-gole@ti.com