arm(64): Replace write32() and friends with writel()

This patch is a raw application of the following spatch to the
directories src/arch/arm(64)?, src/mainboard/<arm(64)-board>,
src/soc/<arm(64)-soc> and src/drivers/gic:

@@
expression A, V;
@@
- write32(V, A)
+ writel(V, A)
@@
expression A, V;
@@
- write16(V, A)
+ writew(V, A)
@@
expression A, V;
@@
- write8(V, A)
+ writeb(V, A)

This replaces all uses of write{32,16,8}() with write{l,w,b}()
which is currently equivalent and much more common. This is a
preparatory step that will allow us to easier flip them all at once to
the new write32(a,v) model.

BRANCH=none
BUG=chromium:451388
TEST=Compiled Cosmos, Daisy, Blaze, Pit, Ryu, Storm and Pinky.

Change-Id: I16016cd77780e7cadbabe7d8aa7ab465b95b8f09
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 93f0ada19b429b4e30d67335b4e61d0f43597b24
Original-Change-Id: I1ac01c67efef4656607663253ed298ff4d0ef89d
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/254862
Reviewed-on: http://review.coreboot.org/9834
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/arch/arm/include/arch/io.h

@@ -33,6 +33,8 @@
   */
 #define readb(a)	read8(a)
 #define writeb(v,a)	write8(v,a)
+#define readw(a)	read16(a)
+#define writew(v,a)	write16(v,a)
 #define readl(a)	read32(a)
 #define writel(v,a)	write32(v,a)