platform/x86/amd/pmc: Remove unnecessary line breaks

Enhance code readability by fixing line break and blank line
inconsistencies.

Also make the return variable "rc" as function level local.

Co-developed-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20250305142615.410178-3-Shyam-sundar.S-k@amd.com


Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>