oprofile: update file list in MAINTAINERS file

oprofile: update file list in MAINTAINERS file

File list now catches:

 $ xargs | eval ls -d $(cat) | sort -u
 arch/*/include/asm/oprofile*.h
 arch/*/oprofile/
 drivers/oprofile/
 include/linux/oprofile.h

 arch/alpha/oprofile/
 arch/arm/oprofile/
 arch/avr32/oprofile/
 arch/blackfin/oprofile/
 arch/ia64/oprofile/
 arch/m32r/oprofile/
 arch/microblaze/oprofile/
 arch/mips/oprofile/
 arch/mn10300/oprofile/
 arch/parisc/oprofile/
 arch/powerpc/include/asm/oprofile_impl.h
 arch/powerpc/oprofile/
 arch/s390/oprofile/
 arch/sh/oprofile/
 arch/sparc/oprofile/
 arch/x86/oprofile/
 drivers/oprofile/
 include/linux/oprofile.h

Signed-off-by: Robert Richter <robert.richter@amd.com>