drivers/intel/fsp1_1,fsp2_0: Refactor logo display

Hide the detail of allocation from cbmem from the FSP.

Loading of a BMP logo file from CBFS is not tied to FSP
version and we do not need two copies of the code, move
it under lib/.

Change-Id: I909f2771af534993cf8ba99ff0acd0bbd2c78f04
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50359
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/include/bootsplash.h

@@ -14,4 +14,8 @@
 void set_bootsplash(unsigned char *framebuffer, unsigned int x_resolution,
 		    unsigned int y_resolution, unsigned int fb_resolution);
 
+
+void bmp_load_logo(uint32_t *logo_ptr, uint32_t *logo_size);
+void bmp_release_logo(void);
+
 #endif