treewide: capitalize 'BIOS'

Also replace 'BIOS' by coreboot when the image is 'coreboot.rom'.

Change-Id: I8303b7baa9671f19a036a59775026ffd63c85273
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38932
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/apollolake/chip.c

@@ -733,7 +733,7 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *silupd)
 	/* Enable Audio clk gate and power gate */
 	silconfig->HDAudioClkGate = cfg->hdaudio_clk_gate_enable;
 	silconfig->HDAudioPwrGate = cfg->hdaudio_pwr_gate_enable;
-	/* Bios config lockdown Audio clk and power gate */
+	/* BIOS config lockdown Audio clk and power gate */
 	silconfig->BiosCfgLockDown = cfg->hdaudio_bios_config_lockdown;
 	if (CONFIG(SOC_INTEL_GLK))
 		glk_fsp_silicon_init_params_cb(cfg, silconfig);