cmake: linker generator: Handle NOT PASS and multiple PASS options

Make it possible to have multiple PASS parameters to
zephyr_linker_section() and zephyr_linker_section_configure() sections
(oring them) OR to have multiple PASS NOT p options (in which case the
sections applies in neither of the passes)

Signed-off-by: Björn Bergman <bjorn.bergman@iar.com>