Set bpfloader MEMLOCK rlimit to at least 8MB

Since bpfloader is only used to create the bpf maps and load bpf
programs on android devices. It is okay to set the MEMLOCK rlimit of
bpfloader to the proper size needed by bpf maps regardless of the global
device values. It helps partner to adopt the bpf feature without
changing the device configuration.

Bug: 119279144
Bug: 129246448
Test: remove device specific rlimit and build and verify bpf maps
created.

Change-Id: Ib97d1d304f4ea9a6215afed76e1c1e28f1415221
Merged-In: Ib97d1d304f4ea9a6215afed76e1c1e28f1415221
(Cherry-pick from commit ee121646cf60988e69eb2c8b1e87e11f5e4932cc)