git revert Revert "Update defconfig"

This reverts commit b6eb4fcabc27fae9fc1c56df453e92aa05a0422d.
Revert "Makefile optimizations"

This reverts commit e4bca1717ba71ae2ff728e09b338786a97dc8957.
Revert "lib/sha1: use the git implementation of SHA-1"

This reverts commit f7de68ab6f95c907279bcca6b7e2522033b5bade.
Revert "lib/string: use glibc version"

This reverts commit 42a9b04fa582c8d359033d019745a2cca81fbe44.
Revert "lib/memcopy: use glibc version"

This reverts commit 781064f15cacede4ab82a9bf0ea21e6b136bf8f8.
Makefile optimizations
Update defconfig
Snatch 2 mb mem from MDP