x86/boot/e820: Standardize __init/__initdata tag placement

So the e820.c file has a hodgepodge of __init and __initdata tag
placements:

    static int __init e820_search_gap(unsigned long *max_gap_start, unsigned long *max_gap_size)
    __init void e820__setup_pci_gap(void)
    __init void e820__reallocate_tables(void)
    void __init e820__memory_setup_extended(u64 phys_addr, u32 data_len)
    void __init e820__register_nosave_regions(unsigned long limit_pfn)
    static int __init e820__register_nvs_regions(void)
    u64 __init e820__memblock_alloc_reserved(u64 size, u64 align)

Standardize on the style used by e820__setup_pci_gap() and place
them before the storage class.

In addition to the consistency, as a bonus this makes the grep output
rather clean looking:

    __init void e820__range_remove(u64 start, u64 size, enum e820_type filter_type)
    __init void e820__update_table_print(void)
    __init static void e820__update_table_kexec(void)
    __init static int e820_search_gap(unsigned long *max_gap_start, unsigned long *max_gap_size)
    __init void e820__setup_pci_gap(void)
    __init void e820__reallocate_tables(void)
    __init void e820__memory_setup_extended(u64 phys_addr, u32 data_len)
    __init void e820__register_nosave_regions(unsigned long limit_pfn)
    __init static int e820__register_nvs_regions(void)

... and if one learns to just ignore the leftmost '__init' noise then
the rest of the line looks just like a regular C function definition.

With the 'mixed' tag placement style the __init tag breaks up the function's
prototype for no good reason.

Do the same for __initdata.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: H . Peter Anvin <hpa@zytor.com>
Cc: Andy Shevchenko <andy@kernel.org>
Cc: Arnd Bergmann <arnd@kernel.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Juergen Gross <jgross@suse.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://patch.msgid.link/20250515120549.2820541-25-mingo@kernel.org

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