Remove the iq2000_select_section function the iq2000 backend - it never provided any useful functionality.

	PR target/59205
	* config/iq2000/iq2000.c (iq2000_select_section): Delete.
	(TARGET_ASM_SELECT_SECTION): Remove definition.
	(TARGET_HAVE_SWITCHABLE_BSS_SECTIONS): Allow definition.

From-SVN: r276304