More Qualcomm driver updates for v5.16

This introduces the Qualcomm "sleep stats" driver, which aids the
efforts of bringing various Qualcomm platforms into low power mode.

The SMP2P driver gains support for negotiating the "SSR" feature, which
is used to better synchronize some corner cases that might appear as the
remoteproc is recovering from a crash.

The socinfo driver learns about a few new PMICs.

SMEM is updated so that it's possible to put the compatible property
directly in the reserved-memory node, to avoid having to have a separate
node just pointing to the memory-region.

Lastly it fixes some bugs in smp2p, apr, rpmhpd drivers, notably
avoiding the issue where powering on a power-domain using rpmhpd while
keeping the performance_state at 0 is a nop
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