fix(tegra194/ras): remove incorrect erxctlr assert

The ERXCTLR_EL1 register reads are RES0 for some error records
leading to a false assert on a read back.

This patch removes the assert on reading back the ERXCTLR_EL1
register to fix this issue.

Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Change-Id: I0cab30b12656a800ba87b8bb94b4c67a2331dee6