msp430.c (msp430_mcu_name): Set the "i" in the symbol defined for msp430i* devices to be lower case.

	* gcc/config/msp430/msp430.c (msp430_mcu_name): Set the "i" in the
	symbol defined for msp430i* devices to be lower case.

	gcc/testsuite/gcc.target/msp430/
	* msp430i-device-symbol.c: New test.
	* msp430f-device-symbol.c: New test.
	* msp430.h: New test header file.

From-SVN: r261268