x86: apl: Use memory-mapped access for VBT

Use the new binman memory-mapping function to access the VBT, to simplify
the code.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/lib/fsp2/fsp_silicon_init.c b/arch/x86/lib/fsp2/fsp_silicon_init.c
index 45c0c7d..0f221a8 100644
--- a/arch/x86/lib/fsp2/fsp_silicon_init.c
+++ b/arch/x86/lib/fsp2/fsp_silicon_init.c
@@ -32,6 +32,7 @@
 			     &rom_offset);
 	if (ret)
 		return log_msg_ret("locate FSP", ret);
+	binman_set_rom_offset(rom_offset);
 	gd->arch.fsp_s_hdr = hdr;
 
 	/* Copy over the default config */