memory: tegra: Restore MC interrupt masks on resume

The MC interrupt mask registers lose their state across Tegra low power
suspend state (aka. SC7). Without re-applying them on resume, MC
interrupts that were enabled at probe remain masked after wake, so any
post-resume MC error goes unreported.

Factor the existing intmask programming out of tegra_mc_probe() into
tegra_mc_setup_intmask() and reuse it from the system resume callback
so the mask state is restored on wake.

Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://patch.msgid.link/20260430095202.1167651-4-amhetre@nvidia.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

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