soc/intel_adsp: Align .rodata with .data in bootloader

This seems to be a mistake in rimage: it wants the text and data
segments of the output module to be page-aligned, but it assumes
.rodata is part of "data" and not "text".  So this reorders the
segments to make that happen.

Note that the page alignment is entirely artificial.  Nothing is
interpreting the segment boundaries rimage is enforcing except for the
code in the bootloader itself, which doesn't care.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>