Before entering the kernel exception level ensure sctlr_el2 and
sctlr_el1 are in a known state. The EOS flag needs to be set to ensure
an eret instruction is a context synchronization event.

Set spcr_el1 when entering the kernel from EL1 and use an eret
instruction to return to the caller. This ensures the CPU pstate is
consistent with the value in spcr_el1 as it is the only way to set it
directly.

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