dm: treewide: Rename 'platdata' variables to just 'plat'

We use 'priv' for private data but often use 'platdata' for platform data.
We can't really use 'pdata' since that is ambiguous (it could mean private
or platform data).

Rename some of the latter variables to end with 'plat' for consistency.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/apollolake/hostbridge.c b/arch/x86/cpu/apollolake/hostbridge.c
index 4b627e3..cb5a816 100644
--- a/arch/x86/cpu/apollolake/hostbridge.c
+++ b/arch/x86/cpu/apollolake/hostbridge.c
@@ -403,7 +403,7 @@
 	.ofdata_to_platdata = apl_hostbridge_ofdata_to_platdata,
 	.probe		= apl_hostbridge_probe,
 	.remove		= apl_hostbridge_remove,
-	.platdata_auto	= sizeof(struct apl_hostbridge_platdata),
+	.plat_auto	= sizeof(struct apl_hostbridge_platdata),
 	ACPI_OPS_PTR(&apl_hostbridge_acpi_ops)
 	.flags		= DM_FLAG_OS_PREPARE,
 };