qti: spmi_arb: Fix NUM_APID and REG_APID_MAP() argument

The NUM_APID value was derived from kernel device tree sources, but I
made a conversion mistake: the amount of bytes in the APID map is the
total size of the "core" register range (0x1100) minus the offset of the
APID map in that range (0x900). This is of course 0x1100 - 0x900 = 0x800
and not 0x200, so the amount of 4-byte integers it can fit is not 0x80
but 0x200. Fix this and make the math more explicit so it can be more
easily factored out and adjusted if that becomes necessary for a future
SoC.

Also fix a dangerous typo in REG_APID_MAP() where the macro would
reference a random variable `i` rather than its argument (`apid`), and
we just got lucky that the only caller in the current code happened to
pass in a variable called `i` as that argument.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I049dd044fa5aeb65be0e7b12150afd6eb4bac0fa

plat/qti/common/src/spmi_arb.c

@@ -10,8 +10,8 @@
 
 #include <spmi_arb.h>
 
-#define REG_APID_MAP(apid)	(0x0C440900U + 4U * i)
-#define NUM_APID		0x80
+#define REG_APID_MAP(apid)	(0x0C440900U + sizeof(uint32_t) * apid)
+#define NUM_APID		((0x1100U - 0x900U) / sizeof(uint32_t))
 
 #define PPID_MASK		(0xfffU << 8)