mb/hp/z220_series: Rename to snb_ivb_desktops

In preparation for adding other similar boards under it as variants.
Tested that z220_cmt still builds.

Change-Id: I96dec173e0d97d8564bad14778333b8231684ef8
Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79434
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/hp/snb_ivb_desktops/Kconfig

@@ -1,4 +1,4 @@
-config BOARD_HP_Z220_SERIES_COMMON
+config BOARD_HP_SNB_IVB_DESKTOPS_COMMON
 	def_bool n
 	select BOARD_ROMSIZE_KB_16384
 	select GFX_GMA_ANALOG_I2C_HDMI_B
@@ -19,12 +19,12 @@ config BOARD_HP_Z220_SERIES_COMMON
 	select USE_NATIVE_RAMINIT
 
 config BOARD_HP_Z220_CMT_WORKSTATION
-	select BOARD_HP_Z220_SERIES_COMMON
+	select BOARD_HP_SNB_IVB_DESKTOPS_COMMON
 
 config BOARD_HP_Z220_SFF_WORKSTATION
-	select BOARD_HP_Z220_SERIES_COMMON
+	select BOARD_HP_SNB_IVB_DESKTOPS_COMMON
 
-if BOARD_HP_Z220_SERIES_COMMON
+if BOARD_HP_SNB_IVB_DESKTOPS_COMMON
 
 config VBOOT
 	select GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC
@@ -38,7 +38,7 @@ config CBFS_SIZE
 	default 0x570000
 
 config MAINBOARD_DIR
-	default "hp/z220_series"
+	default "hp/snb_ivb_desktops"
 
 config VARIANT_DIR
 	default "z220_cmt_workstation" if BOARD_HP_Z220_CMT_WORKSTATION