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Identify the rest of the hardware constants (#371)

See https://github.com/pret/pokecrystal/pull/972 and https://github.com/pret/pokecrystal/pull/947 for details.

--- a/constants/hardware_constants.asm

+++ b/constants/hardware_constants.asm

@@ -119,12 +119,8 @@

 DEF rBGPD             EQU $ff69 ; CGB Mode Only - Background Palette Data

 DEF rOBPI             EQU $ff6a ; CGB Mode Only - Sprite Palette Index

 DEF rOBPD             EQU $ff6b ; CGB Mode Only - Sprite Palette Data

-DEF rUNKNOWN1         EQU $ff6c ; (FEh) Bit 0 (Read/Write) - CGB Mode Only

+DEF rOPRI             EQU $ff6c ; CGB Mode Only - Object Priority Mode

 DEF rSVBK             EQU $ff70 ; CGB Mode Only - WRAM Bank

-DEF rUNKNOWN2         EQU $ff72 ; (00h) - Bit 0-7 (Read/Write)

-DEF rUNKNOWN3         EQU $ff73 ; (00h) - Bit 0-7 (Read/Write)

-DEF rUNKNOWN4         EQU $ff74 ; (00h) - Bit 0-7 (Read/Write) - CGB Mode Only

-DEF rUNKNOWN5         EQU $ff75 ; (8Fh) - Bit 4-6 (Read/Write)

-DEF rUNKNOWN6         EQU $ff76 ; (00h) - Always 00h (Read Only)

-DEF rUNKNOWN7         EQU $ff77 ; (00h) - Always 00h (Read Only)

+DEF rPCM12            EQU $ff76 ; Channels 1 & 2 Amplitude (R)

+DEF rPCM34            EQU $ff77 ; Channels 3 & 4 Amplitude (R)

 DEF rIE               EQU $ffff ; Interrupt Enable (R/W)