[PATCH] serial: mpsc driver has definition of SUPPORT_SYSRQ below include of serial_core.h

The definition of SUPPORT_SYSRQ must come before #include of serial_core.h.
This patch moves the definition of SUPPORT_SYSRQ to be just after the #include
of config.h to make it consistent with 8250.c.

Reported-by: Stephane Chazelas <Stephane@artesyncp.com>
Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>