[llvm-readelf] - Do not treat SHT_ANDROID_RELR sections the same as SHT_RELR.

Currently, when dumping section headers, llvm-readelf
prints "RELR" for SHT_ANDROID_RELR/SHT_RELR sections.
The behavior was introduced in D47919 and revealed in D84330.

But "SHT_ANDROID_RELR" has a different value from "SHT_RELR".
Also, "SHT_ANDROID_REL/SHT_ANDROID_RELA" are printed as "ANDROID_REL/ANDROID_RELA",
what makes the handling of the "SHT_ANDROID_RELR" inconsistent.

This patch makes llvm-readelf to print "ANDROID_RELR" instead of "RELR".

Differential revision: https://reviews.llvm.org/D84393