Fix handling of EFI with big memory maps.

	Fix handling of EFI with big memory maps.

	* grub-core/loader/i386/linux.c (GRUB_LINUX_CL_OFFSET): Removed.
	(real_mode_mem): Likewise.
	(real_mode_target): Likewise.
	(real_mode_pages): Likewise.
	(prot_mode_pages): Likewise.
	(linux_params): New var.
	(linux_cmdline): Likewise.
	(free_pages): Don't set real mode variables.
	(allocate_pages): Don't allocate real mode memory.
	(grub_e820_add_region): Remove the limit.
	(grub_linux_boot): Allocate and copy real mode memory.
	(grub_linux_unload): Free linux_cmdline.
	(grub_cmd_linux): Use temporary storage for parameters.
	(grub_cmd_initrd): Likewise.
	* include/grub/i386/linux.h (GRUB_E820_MAX_ENTRY): Removed.
	(linux_kernel_params): Make it 1K big.