CVE-2026-99259: soc/tegra: pmc: Fix uninitialised clock rate

In the Linux kernel, the following vulnerability has been resolved:

soc/tegra: pmc: Fix uninitialised clock rate

For legacy 32-bit Tegra devices, the warning in the tegrapmcentersuspendmode() function is being triggered because the earlypmc->rate variable is never configured and hence, always 0. This issue started occurring after updating the PMC driver to create the PMC context dynamically which causes the 'rate' to be set in the new dynamic context, but missed updating the rate in the early PMC context.

Fix this by initialising the earlypmc->rate variable for 32-bit Tegra devices when the rate for the PMC context is initialised.

[treding@nvidia.com: move assignment to existing #ifdef block]