test: Cover all CPU templates in rdmsr consistency test

There was a TODO that had been procrastinated for a long time.
test_cpu_rdmsr only covered a limited set of static CPU templates. Now
it covers all the cases (no CPU template, all static CPU templates and
all custom CPU templates). This will help test a new CPU template for
Intel Sapphire Rapids.

Signed-off-by: Takahiro Itazuri <[email protected]>

Author: zulinx86