bootimg_pcbios: seperate bootloader config creation

Most bootloaders that will be included in this
wics plugin will require a configuration file
to define kernel params, execute custom
modules, or enable the ability to select
one of multiple boot entries.

Create a seperate generic function to facilitate
finding if a bootloader config file passed through
bootloader --configfile flag. So, that other functions
that are used to create/install a bootloader boot
configuration file can leverage the function.

(From OE-Core rev: 7944e29eb6ab7b80ad3847686dd780100623b196)

Signed-off-by: Vincent Davis Jr. <vince@underview.tech>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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