docs: Removed needless .cfg lines and update ubios info

docs/kernel/ubios.md

@@ -3,6 +3,14 @@
 Mapped into [0x680000,0x6FFFFF] which is aliasedsize at the end of 32-bit physical address space.
 The x86 CPU init/reset state set CS:IP := 0xFFFFFFF0, matching the 80010002 entry point (0x6FFFF0) thanks to the alias.
 
+## AGESA
+
+One of three available images will be loaded at 0x680000:
+
+- GladiusBDK
+- ClaytonBDK
+- ThebePBDK
+
 ## KASLR
 
 The 20-byte buffer at 0x600160 is memcpy'd to a zero-initialized 80-byte SHA1 block, and a single SHA1 transform (80 rounds) is applied.

resources/boot/grub/env-common.cfg

@@ -109,23 +109,12 @@ write_word 0x9B6BC 0x640
 # Unknown
 write_byte 0x9B6BF 0xFF
 
-# DD3 Capacity
-write_dword 0x9B6C0 0x40000000
-
 # Unknown
 write_dword 0x9B6C4 0x0
 write_dword 0x9B6C8 0x0
 
 # ...
 
-# Subsystem ID
-# Values:
-# - 0x1XXXX  Aeolia
-# - 0x2XXXX  Belize
-# - 0x3XXXX  Baikal
-# - 0x4XXXX  Belize
-write_dword 0x9B6E0 0x10200
-
 # Unknown
 write_byte 0x9B6DD 0xFF