binman: Keep the efi_capsule input file

There is no need to remove input files. It makes it harder to diagnose
failures. Keep the payload file.

There is no test for this condition, but one could be added.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Sughosh Ganu <sughosh.ganu@linaro.org>

tools/binman/etype/efi_capsule.py

@@ -148,7 +148,6 @@ class Entry_efi_capsule(Entry_section):
                                                  self.fw_version,
                                                  self.oem_flags)
         if ret is not None:
-            os.remove(payload)
             return tools.read_file(capsule_fname)
         else:
             # Bintool is missing; just use the input data as the output