bump grub revision to 2.12-rc1

This is specifically the following Git revision:
7a994c87f571ac99745645be0bdde9827297321a
from 10 July 2023

The keyboard fix for HP EliteBooks was merged upstream,
so lbmk no longer needs this patch; it comes with GRUB.

Signed-off-by: Leah Rowe <leah@libreboot.org>

resources/git/revisions

@@ -14,7 +14,7 @@
 }
 
 {grub}{
-	rev: f7564844f82b57078d601befadc438b5bc1fa01b
+	rev: 7a994c87f571ac99745645be0bdde9827297321a
 	loc: grub
 	url: git://git.savannah.gnu.org/grub.git
 	bkup_url: http://git.savannah.gnu.org/r/grub.git

resources/grub/patches/0005-at-keyboard-timeout.patch

@@ -1,36 +0,0 @@
-From 674002256247a01f4969a3795a5aceca68792a55 Mon Sep 17 00:00:00 2001
-From: Riku Viitanen <riku.viitanen@protonmail.com>
-Date: Fri, 21 Apr 2023 21:41:07 +0300
-Subject: [PATCH] at_keyboard.c: add timeout to fix hang on hp elitebooks
-
-This fixes GRUB on Coreboot on HP EliteBooks by implementing
-a 200ms timeout. GRUB used to hang. see: https://ticket.coreboot.org/issues/141
----
- grub-core/term/at_keyboard.c | 11 ++++++++++-
- 1 file changed, 10 insertions(+), 1 deletion(-)
-
-diff --git a/grub-core/term/at_keyboard.c b/grub-core/term/at_keyboard.c
-index 597111077..28d1d0a77 100644
---- a/grub-core/term/at_keyboard.c
-+++ b/grub-core/term/at_keyboard.c
-@@ -42,7 +42,16 @@ keyboard_controller_wait_until_ready (void)
- {
-   /* 50 us would be enough but our current time resolution is 1ms.  */
-   grub_millisleep (1);
--  while (! KEYBOARD_COMMAND_ISREADY (grub_inb (KEYBOARD_REG_STATUS)));
-+
-+  unsigned i = 200;
-+  while (! KEYBOARD_COMMAND_ISREADY (grub_inb (KEYBOARD_REG_STATUS))) {
-+    grub_millisleep (1);
-+
-+    /* Timeout */
-+    if (! i--) {
-+      break;
-+    }
-+  }
- }
- 
- static grub_uint8_t
--- 
-2.40.0
-