x86/boot: add start and size fields to struct boot_module

x86/boot: add start and size fields to struct boot_module

Introduce the start and size fields to struct boot_module and assigns
their value during boot_info construction. All uses of module_t to get
the address and size of a module are replaced with start and size.

The EFI entry point is a special case, as the EFI file loading boot
service may load a file beyond the 4G barrier. As a result, to make the
address fit in the 32bit integer used by the MB1 module_t structure, the
frame number is stored in mod_start and size in mod_end. Until the EFI
entry point is enlightened to work with boot_info and boot_module,
multiboot_fill_boot_info will handle the alternate values in mod_start
and mod_end when EFI is detected.

A result of the switch to start/size removes all uses of the mod field
in struct boot_modules, along with the uses of bootstrap_map() and
release_module() functions. With all usage gone, they all are dropped
here.

Signed-off-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>