Move all of constants/sram_constants.asm into sram

This way we can easily use `BANK()` where appropriate, and it is more
tidy.

constants/misc_constants.asm

@@ -142,6 +142,7 @@ NUM_WILDMONS_PER_AREA_TIME_OF_DAY EQU 7
 WILDMON_GRASS_STRUCTURE_LENGTH EQU 2 + 3 * (1 + 2 * NUM_WILDMONS_PER_AREA_TIME_OF_DAY)
 
 MOBILE_EVENT_OBJECT_GS_BALL EQU $b
+MOBILE_LOGIN_PASSWORD_LENGTH EQU 17
 
 MALE EQU 0
 FEMALE EQU 1