reset: Finalize move to new API

Move soft_reset() to `southbridge/amd/common/` it's only used for
amdfam10 now.

Drop hard_reset() for good.

Change-Id: Ifdc5791160653c5578007f6c1b96015efe2b3e1e
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/29059
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/include/reset.h

@@ -39,14 +39,4 @@ __noreturn void board_reset(void);
  */
 void do_board_reset(void);
 
-/* Full board reset. Resets SoC and most/all board components (e.g. DRAM). */
-__noreturn void hard_reset(void);
-/* Board reset. Resets SoC some board components (e.g. TPM but not DRAM). */
-__noreturn void soft_reset(void);
-
-/* Reset implementations. Implement these in SoC or mainboard code. Implement
-   at least hard_reset() if possible, others fall back to it if necessary. */
-void do_hard_reset(void);
-void do_soft_reset(void);
-
 #endif