MAINTAINERS: git://github -> https://github.com for kleikamp

Github deprecated the git:// links about a year ago, so let's move to
the https:// URLs instead.

Reported-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://github.blog/2021-09-01-improving-git-protocol-security-github/


Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

Also changed status from Maintained to Odd Fixes

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>