Fix pgm_read_ptr() define for ARM (qmk#8658)

Author: fauxpark

tmk_core/common/progmem.h

@@ -8,7 +8,7 @@
 #    define pgm_read_byte(address_short) *((uint8_t*)(address_short))
 #    define pgm_read_word(address_short) *((uint16_t*)(address_short))
 #    define pgm_read_dword(address_short) *((uint32_t*)(address_short))
-#    define pgm_read_ptr(address_short) *((void*)(address_short))
+#    define pgm_read_ptr(address_short) *((void**)(address_short))
 #    define strcmp_P(s1, s2) strcmp(s1, s2)
 #    define strcpy_P(dest, src) strcpy(dest, src)
 #    define strlen_P(src) strlen(src)