Remove redundant config.mk files

Remove redundant config.mk files

Recent cleanup actions resulted in a number of config.mk files that
contained only redundant entries like

	PLATFORM_CPPFLAGS += -I$(TOPDIR)

or settings of variables that were not used anywhere in the code, like

	TEXT_END  = 0xfe080000

Remove these unnecessary files.

Signed-off-by: Wolfgang Denk <[email protected]>
Cc: Scott McNutt <[email protected]>
Cc: Wolfgang Wegner <[email protected]>
Cc: Josef Wagner <[email protected]>
Cc: Tolunay Orkun <[email protected]>
Cc: Frank Panno <[email protected]>
Cc: Heiko Schocher <[email protected]>
Cc: Brad Kemp <[email protected]>
Acked-by: Heiko Schocher<[email protected]>