Boot2_is25lp080 in SDK 1.5.1 pads to all 0s

[earlephilhower]

When the BOOT2.S files were updated in 1.5.1, the section name in the IS25LP080 code was set to text and not .text.

The missing . causes the actual boot code to be thrown out since the rest of the infrastructure expects .section .text and not .section text

The end result is that when you attempt to build and pad this bootloader, you end up with all 0s instead of the QSPI setup code.

[kilograham]

merged into develop