x86/boot/compressed: Use boot_kstrtoul() for hugepages= parsing

Replace simple_strtoull() with boot_kstrtoul() for parsing the hugepages= boot
parameter.

Unlike simple_strtoull(), boot_kstrtoul() performs strict validation and
returns an error on invalid inputs instead of silently accepting partial
input. Use boot_kstrtoul() to reject and warn about invalid hugepages= values.

boot_kstrtoul() also converts the input directly to an unsigned long and
avoids implicit casting as max_gb_huge_pages *is* an unsigned long.

  [ bp: Massage commit message. ]

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260409161600.152012-2-thorsten.blum@linux.dev

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