AVR: target/122222 - Add modules for __floatsidf, __floatunsidf.

AVR: target/122222 - Add modules for __floatsidf, __floatunsidf.

	PR target/122222
libgcc/config/avr/libf7/
	* libf7-asm.sx (D_floatsidf, D_floatunsidf): New modules.
	* libf7-common.mk (F7_ASM_PARTS): Add D_floatsidf, D_floatunsidf.
	(F7F, g_dx): Remove floatunsidf, floatsidf.
	* libf7.c (f7_set_s32): Don't alias to f7_floatsidf.
	(f7_set_u32): Don't alias to f7_floatunsidf.
	* f7-renames.h: Rebuild
	* f7-wraps.h: Rebuild.

gcc/testsuite/
	* gcc.target/avr/pr122222-sitod.c: New test.