soc: xilinx: zynqmp: Fix zu1cg device detection

soc: xilinx: zynqmp: Fix zu1cg device detection

Currently u-boot displayed a zu1cg soc as "Chip:  zu1eg".
A value of 0468_8093h in the IDCODE (CSU) Register defines a ZU1 soc
not only for the EG family but also for the CG family as described
in the Xilinx Zynq UltraScale+ UG1085 documentation in Table 1-2.

Signed-off-by: Frank Böwingloh <f.boewingloh@beckhoff.com>
Cc: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20250808123134.636-1-f.boewingloh@beckhoff.com
Signed-off-by: Michal Simek <michal.simek@amd.com>