sepolicy: perf: Bring-in perf sepolicy fixes from 'O'

This change is the squash of following sepolicy denial fixes.

1. Adding rule for memlat devfreq node

a) Adding sepolicy rule to access memlat gov. based
devfreq node.

CRs-Fixed: 2120803

b) sepolicy: Update memlat-cpu2 node with secontext

CRs-Fixed: 2168934

2. common: Add policy to read meminfo.

CRs-Fixed: 2184588

3. Add permission for process_reclaim nodes

CRs-Fixed: 2142065

4. Add rule for process_reclaim access from perfhal

CRs-Fixed: 2144019

5. sepolicy: Add vendor toolbox file context

Vendor toolbox binary is required to use executables
to create additional swap file for apps. This change sets
toolbox_executable file context to vendor toolbox binary

CRs-Fixed: 2185563

6. 8909: Enable grep from vendor path

Enable grep command from vendor path, to be used in post_boot.

CRs-Fixed: 2142065

7. sepolicy: Fix denials for mmc clk_scaling & read_ahead_kb.

Fix mmc host clk_scaling and read_ahead_kb denials.

CRs-Fixed: 2147521

Squash of following change-IDs:
       Change-Id: I08fee53d636314167d0d7a971e3cefbf7ab081a8
       Change-Id: Ic34a6c69e8966549d2100fc7dd6a7ac321f310c5
       Change-Id: I8812b2e16233d4b5de065e07a200415d24c80874
       Change-Id: Ifb7cdb00119bace5132eddff0557f07680ac54cc
       Change-Id: Ia66f9b583f047069acd4bba687171b3cb71f1808
       Change-Id: I8151c45d379f73915d2226f0d58369d77849a030
       Change-Id: Ib5b1f2dd1fd20a603c997a34b73609449c93fe8f
       Change-Id: I18fb915353c9ca92f63ba3a1d9d6d4ae46f0d9bd

Change-Id: Ibe0333ffad2afec02ae5fb27dece3579b309c1e9
5 files changed