ANDROID: KVM: arm64: Set up S2MPU Memory Protection Table

S2MPU Second-level Memory Protection Table is a PA-contiguous buffer
containing an array of 2-bit read/write entries at given granularity
for a given gigabyte physical address space region. The size of SMPT
varies per granularity but at the finest 4K granularity it is 64KB
PA-contiguous, aligned to 64KB.

Allocate sufficient number of SMPT buffers for the S2MPU driver assuming
4K granularity for 4K/16K PAGE_SIZE, and 64K granularity for 64K
PAGE_SIZE. We also assume that all S2MPUs share SMPTs for a given
gigabyte region. There are 34 gigabyte regions that can be set by the
driver (GBs 4-33 always block all traffic).

Hyp takes ownership of the memory in s2mpu_init and assigns pointers to
the buffers to L1ENTRY_L2TABLE_ADDR registers on init and power-on
events. The pointers remain static as the driver will only change
granularity between 1G and 4K/64K (depending on PAGE_SIZE).

Test: builds, boots
Bug: 190463801
Signed-off-by: David Brazdil <dbrazdil@google.com>
Change-Id: If27436087ebba1dd0a977960d960d5eaff4279fd