Updated x86 linker scripts with missing variable

hal/x86_fsp_qemu.ld.in

@@ -25,6 +25,8 @@ SECTIONS
        _end_wolfboot = .;
     } > RAM
 
+    _stored_data = _end_text;
+
      _fsp_size = _end_fsp_s - _start_fsp_s;
     .bss WOLFBOOT_LOAD_BASE + SIZEOF(.text) (NOLOAD):
     {

hal/x86_fsp_qemu_stage1.ld.in

@@ -56,6 +56,7 @@ SECTIONS
 
     .bootloader WOLFBOOT_ORIGIN :
     {
+       _start_text = .;
        KEEP(*(.boot*))
        *(.text*)
        *(.rodata*)

hal/x86_fsp_tgl.ld.in

@@ -25,6 +25,7 @@ SECTIONS
        _end_wolfboot = .;
     }
 
+    _stored_data = _end_text;
     _fsp_size = _end_fsp_s - _start_fsp_s;
     .bss WOLFBOOT_LOAD_BASE + SIZEOF(.text) (NOLOAD):
     {

hal/x86_fsp_tgl_stage1.ld.in

@@ -53,6 +53,7 @@ SECTIONS
 
     .bootloader WOLFBOOT_ORIGIN :
     {
+       _start_text = .;
        KEEP(./tgl_fsp.o(.boot))
        KEEP(*(.boot*))
        KEYSTORE_START = .;