x86: Convert arch_fsp_init() to use events

Convert this to use events instead of calling a function directly in the
init sequence.

Rename it to arch_fsp_init_f() to distinguish it from the one that happens
after relocation.

For FSPv2 nothing needs to be done here, so drop the empty function.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/init.h

@@ -57,17 +57,6 @@ int arch_cpu_init(void);
  */
 int mach_cpu_init(void);
 
-/**
- * arch_fsp_init() - perform firmware support package init
- *
- * Where U-Boot relies on binary blobs to handle part of the system init, this
- * function can be used to set up the blobs. This is used on some Intel
- * platforms.
- *
- * Return: 0
- */
-int arch_fsp_init(void);
-
 /**
  * arch_fsp_init() - perform post-relocation firmware support package init
  *