add oracle to to token registration

Signed-off-by: microwavedcola1 <microwavedcola@gmail.com>

programs/mango-v4/src/instructions/register_token.rs

@@ -40,6 +40,8 @@ pub struct RegisterToken<'info> {
     )]
     pub vault: Account<'info, TokenAccount>,
 
+    pub oracle: UncheckedAccount<'info>,
+
     #[account(mut)]
     pub payer: Signer<'info>,
 
@@ -81,6 +83,7 @@ pub fn register_token(
         group: ctx.accounts.group.key(),
         mint: ctx.accounts.mint.key(),
         vault: ctx.accounts.vault.key(),
+        oracle: ctx.accounts.oracle.key(),
         deposit_index: INDEX_START,
         borrow_index: INDEX_START,
         indexed_total_deposits: I80F48::ZERO,

programs/mango-v4/src/state/token_bank.rs

@@ -8,6 +8,7 @@ pub struct TokenBank {
     pub group: Pubkey,
     pub mint: Pubkey,
     pub vault: Pubkey,
+    pub oracle: Pubkey,
 
     /// the index used to scale the value of an IndexedPosition
     /// TODO: should always be >= 0, add checks?