spl: fix build failure with !CONFIG_SPL_PCI_SUPPORT

Building U-Boot with CONFIG_PCI and CONFIG_DM_PCI enabled, but
CONFIG_SPL_PCI_SUPPORT disabled, results in following linker
error:

lib/built-in.o: In function `fdtdec_get_pci_bar32':
lib/fdtdec.c:305: undefined reference to `dm_pci_read_bar32'
fdtdec.c:305:(.text.fdtdec_get_pci_bar32+0x24): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `dm_pci_read_bar32'

This is because reference to dm_pci_read_bar32() remains in lib/fdtdec.c
while SPL build does not descend into drivers/pci directory in
drivers/Makefile if CONFIG_SPL_PCI_SUPPORT is not enabled.

Fix this by applying appropriate #define guards in lib/fdtdec.c.
It looks like ns16550.c has the same problem, so fixed that too.

To simplify this, CONFIG_SPL_PCI_SUPPORT is renamed to CONFIG_SPL_PCI
(enables use of CONFIG_IS_ENABLED() macro).

Suggested-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/Makefile b/drivers/Makefile
index 0538b50..752caea 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -10,7 +10,7 @@
 obj-$(CONFIG_$(SPL_TPL_)MMC_SUPPORT) += mmc/
 obj-$(CONFIG_$(SPL_TPL_)NAND_SUPPORT) += mtd/nand/raw/
 obj-$(CONFIG_$(SPL_TPL_)PCH_SUPPORT) += pch/
-obj-$(CONFIG_$(SPL_TPL_)PCI_SUPPORT) += pci/
+obj-$(CONFIG_$(SPL_TPL_)PCI) += pci/
 obj-$(CONFIG_$(SPL_TPL_)PHY) += phy/
 obj-$(CONFIG_$(SPL_TPL_)PINCTRL) += pinctrl/
 obj-$(CONFIG_$(SPL_TPL_)RAM) += ram/