Fix a few build warnings and one kconfig warning on SUPERH.

v3: add some Tested-by: and Reviewed-by:
    add 2 more patches
    renumber, rebase, and resend

v2: add a previously-sent Kconfig patch
    add a few more Cc's

 [PATCH 1/5 v3] sh: fix kconfig unmet dependency warning for FRAME_POINTER
 [PATCH 2/5 v3] sh: add git tree to MAINTAINERS
 [PATCH 3/5 v3] sh: math-emu: drop unused functions
 [PATCH 4/5 v3] sh: define __BIG_ENDIAN for math-emu
 [PATCH 5/5 v3] sh: fix READ/WRITE redefinition warnings

 MAINTAINERS                       |    1 
 arch/sh/Kconfig.debug             |    1 
 arch/sh/include/asm/sfp-machine.h |    8 +
 arch/sh/math-emu/math.c           |  147 ++++------------------------
 4 files changed, 32 insertions(+), 125 deletions(-)

Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.kernel.org
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>