voicebus, wcaxx, wct4xxp: Remove include of pci-aspm.h

Linux 5.4, in commit  (7ce2e76a0420801fb4b53b9e685094 "PCI: Move ASPM
declarations to linux/pci.h") [1], removed pci-aspm.h.

This commit removes the global include of pci-aspm.h in include/dahdi/kernel.h
(because it only pertains to certain drivers), and moves the conditional include
into only the drivers that need it.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7ce2e76a0420801fb4b53b9e685094

Signed-off-by: Shaun Ruffell <sruffell@sruffell.net>

drivers/dahdi/voicebus/voicebus.h

@@ -64,7 +64,11 @@
  * platform does not support it.
  *
  */
-#undef CONFIG_VOICEBUS_DISABLE_ASPM
+#ifdef CONFIG_VOICEBUS_DISABLE_ASPM
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0)
+#include <linux/pci-aspm.h>
+#endif
+#endif
 
 /* Define this to use a FIFO for the software echocan reference.
  * (experimental) */

drivers/dahdi/wcaxx-base.c

@@ -67,6 +67,12 @@
 #include "wcxb_spi.h"
 #include "wcxb_flash.h"
 
+#ifdef CONFIG_VOICEBUS_DISABLE_ASPM
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0)
+#include <linux/pci-aspm.h>
+#endif
+#endif
+
 /*!
  * \brief Default ringer debounce (in ms)
  */

drivers/dahdi/wct4xxp/base.c

@@ -87,6 +87,12 @@
  */
 /* #define CONFIG_WCT4XXP_DISABLE_ASPM */
 
+#ifdef CONFIG_WCT4XXP_DISABLE_ASPM
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0)
+#include <linux/pci-aspm.h>
+#endif
+#endif
+
 #if defined(CONFIG_FORCE_EXTENDED_RESET) && defined(CONFIG_NOEXTENDED_RESET)
 #error "You cannot define both CONFIG_FORCE_EXTENDED_RESET and " \
 		"CONFIG_NOEXTENDED_RESET."

include/dahdi/kernel.h

@@ -58,10 +58,6 @@
 
 #include <linux/poll.h>
 
-#ifdef CONFIG_PCI
-#include <linux/pci-aspm.h>
-#endif
-
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
 #define HAVE_NET_DEVICE_OPS
 #endif