msm: kgsl: Make reclaim an adreno feature instead of a Kconfig option

Having process reclaim and the option of using SHMEM as Kconfig options,
makes it difficult to enable them on a per target basis as some targets
share the same set of configs. So remove them as Kconfig options and
turn them into adreno feature flags. Also enable the feature
ADRENO_PROCESS_RECLAIM for A702.

Change-Id: Iedb50fc4fa77ee5fc4f96a3607e7d8093ede8dd0
Signed-off-by: Puranam V G Tejaswi <pvgtejas@codeaurora.org>