mmio: Add clrsetbitsXX() API in place of updateX()

This patch removes the recently added update8/16/32/64() API and
replaces it with clrsetbits8/16/32/64(). This is more in line with the
existing endian-specific clrsetbits_le16/32/64() functions that have
been used for this task on some platforms already. Rename clrsetbits_8()
to clrsetbits8() to be in line with the new naming.

Keep this stuff in <device/mmio.h> and get rid of <mmio.h> again because
having both is confusing and we seem to have been standardizing on
<device/mmio.h> as the standard arch-independent header that all
platforms should include already.

Also sync libpayload back up with what we have in coreboot. (I'm the
original author of the clrsetbits_le32-definitions so I'm relicensing
them to BSD here.)

Change-Id: Ie4f7b9fdbdf9e8c0174427b4288f79006d56978b
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37432
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/endian.h

@@ -79,11 +79,6 @@
 #define clrsetbits_le16(addr, clear, set) __clrsetbits(le, 16, addr, clear, set)
 #define clrsetbits_be16(addr, clear, set) __clrsetbits(be, 16, addr, clear, set)
 
-#define clrsetbits_8(addr, clear, set) \
-	write8(addr, (read8(addr) & ~(clear)) | (set))
-#define clrbits_8(addr, clear) clrsetbits_8(addr, clear, 0)
-#define setbits_8(addr, set) setbits_8(addr, 0, set)
-
 #ifndef __ROMCC__
 /* be16dec/be32dec/be64dec/le16dec/le32dec/le64dec family of functions. */
 #define DEFINE_ENDIAN_DEC(endian, width) \