We already determine whether the target is PMSAv8 or (PMSAv6/PMSAv7)
using the selected architecture profile (ARMv6-M/ARMv7-M or ARMv8-M
Baseline/Mainline) and define a symbol accordingly. Make use of that
symbol everywhere instead of repeating CPU checks all over arch code.
While at it, drop the allowlist which generated a build error when the
MPU was enabled on an "unknown" CPU. The header is only included from
SoC-specific code which knows whether an MPU exists or not, or generic
code gated behind CONFIG_ARM_MPU, which guarantees that the MPU exists
as CONFIG_ARM_MPU depends on CONFIG_CPU_HAS_ARM_MPU.
Note: this tangentially fixes a bug that misclassified ARMv8-R targets
as using the PMSAv6/PMSAv7 MPU. This bug did not seem to have any
adverse effect though...
Signed-off-by: Mathieu Choplain <mathieu.choplain-ext@st.com>
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