power: make pfuze100 be able to coexist with other pmics

Avoid uding pmic_init() as this forces the model of only allowing a
single PMIC driver to be built at a time.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

drivers/power/pmic/pmic_pfuze100.c

@@ -11,7 +11,7 @@
 #include <power/pmic.h>
 #include <power/pfuze100_pmic.h>
 
-int pmic_init(unsigned char bus)
+int power_pfuze100_init(unsigned char bus)
 {
 	static const char name[] = "PFUZE100_PMIC";
 	struct pmic *p = pmic_alloc();

include/power/pfuze100_pmic.h

@@ -93,4 +93,5 @@ enum {
 #define SWBST_MODE_AUTO	(2 << 2)
 #define SWBST_MODE_APS	(2 << 3)
 
+int power_pfuze100_init(unsigned char bus);
 #endif