PCI: endpoint: Fix Kconfig indent style

Change to follow the Kconfig style guide. This patch fixes to use tab
rather than space to indent, while help text is indented an additional
two spaces.

Link: https://lore.kernel.org/r/20220815025006.48167-1-mie@igel.co.jp
Fixes: e35f56b ("PCI: endpoint: Support NTB transfer between RC and EP")
Signed-off-by: Shunsuke Mie <mie@igel.co.jp>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>

Author: ShunsukeMie

drivers/pci/endpoint/functions/Kconfig

@@ -27,13 +27,13 @@ config PCI_EPF_NTB
 	  If in doubt, say "N" to disable Endpoint NTB driver.
 
 config PCI_EPF_VNTB
-        tristate "PCI Endpoint NTB driver"
-        depends on PCI_ENDPOINT
-        depends on NTB
-        select CONFIGFS_FS
-        help
-          Select this configuration option to enable the Non-Transparent
-          Bridge (NTB) driver for PCIe Endpoint. NTB driver implements NTB
-          between PCI Root Port and PCIe Endpoint.
+	tristate "PCI Endpoint NTB driver"
+	depends on PCI_ENDPOINT
+	depends on NTB
+	select CONFIGFS_FS
+	help
+	  Select this configuration option to enable the Non-Transparent
+	  Bridge (NTB) driver for PCIe Endpoint. NTB driver implements NTB
+	  between PCI Root Port and PCIe Endpoint.
 
-          If in doubt, say "N" to disable Endpoint NTB driver.
+	  If in doubt, say "N" to disable Endpoint NTB driver.