mk: x86_fsp: stage1: don't remove fsp_s_signature file

it's needed to compute the hash of PCR TPM register

Author: rizlik

stage1/x86_fsp.mk

@@ -37,7 +37,7 @@ sig_fsp_s.o: fsp_s.o $(SIGN_KEY) ../$(FSP_S_BIN)
 	$(SIGN_TOOL) $(SIGN_OPTIONS) ../$(FSP_S_BIN) $(SIGN_KEY) 1
 	@dd if=$(X86FSP_PATH)/fsp_s_v1_signed.bin of=$(X86FSP_PATH)/fsp_s_signature.bin bs=$(IMAGE_HEADER_SIZE) count=1
 	$(OBJCOPY) -I binary -O elf32-i386 -B i386 --rename-section .data=.sig_fsp_s $(X86FSP_PATH)/fsp_s_signature.bin sig_fsp_s.o
-	@rm -f $(X86FSP_PATH)/fsp_s_v1_signed.bin $(X86FSP_PATH)/fsp_s_signature.bin
+	@rm -f $(X86FSP_PATH)/fsp_s_signature.bin
 
 sig_wolfboot_raw.o: wolfboot_raw.bin $(SIGN_KEY)
 	$(SIGN_TOOL) $(SIGN_OPTIONS) wolfboot_raw.bin $(SIGN_KEY) 1