arm64: dts: ti: k3-j721e-main: crypto node cleanup

crypto driver itself is not dma-coherent. So drop the
dma-coherent property.

Fix the clock ID for rng node. It uses DEV_SA2_UL0_X1_CLK,
not DEV_SA2_UL0_PKA_IN_CLK.

Fixes: 8ebcaaae

 ('arm64: dts: ti: k3-j721e-main: Add crypto
 accelerator node')
Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>