Add Shellcode and Config For Xiaomi Pad 6 (Pipa) (#4)

Added pipa Shellcode & sm8250 config.
Magnetic Case closed= Android
Magnetic Case Open= UEFI

Author: pipa-pussy

Config/DualBoot.Sm8250.cfg

@@ -0,0 +1,2 @@
+StackBase=0x9FC00000
+StackSize=0x00300000

ShellCode/ShellCode.Pipa.S

@@ -0,0 +1,14 @@
+.include "DummyHead.S"
+
+/* Shell Code for Xiaomi Pad 6 (Pipa) */
+_ShellCodeStart:
+    movz    x4, #0xe004
+    movk    x4, #0xf96, lsl #16    // Store 0xf96E004 to x4, which is address of GPIO 110.
+    ldr     w6, [x4]                // Get status value from address stored in x4 and store it to w6.
+    nop
+    nop
+    and     w6, w6, #1              // w6 & 1 and stored in w6.
+    cbnz    w6, _UEFI               // Compare w6 with 0, if w6 == 0 goto _UEFI, else execute next instruction(jmp Linux).
+
+.include "CommonTail.S"
+/* Do not remove the last line  */