Move Mips arch-specific resource directories

Bug: http://b/68816454

They were incorrectly named to 'mips' and 'mips64' instead of 'mipsel'
and 'mips64el'.  Clang uses the arch name from the triple (which has the
'el' suffix) to find the arch-specific resource directory to add at link
time.

Test: Build
Change-Id: I86b17900b9854e14a63c60aeee95307c58c1b9f7
8 files changed