dde_bsd: properly name PCI audio driver component

Instead of the generic name, call the PCI driver 'pci_audio_drv'.

This is preliminary clean-up work before introducing the USB audio
driver.

Issue #3929.

repos/dde_bsd/recipes/pkg/bsd_audio_drv/runtime

@@ -1,4 +1,4 @@
-<runtime ram="16M" caps="256" binary="audio_drv">
+<runtime ram="16M" caps="256" binary="pci_audio_drv">
 
 	<requires> <platform/> <rm/> <timer/> </requires>
 
@@ -11,7 +11,7 @@
 
 	<content>
 		<rom label="ld.lib.so"/>
-		<rom label="audio_drv"/>
+		<rom label="pci_audio_drv"/>
 	</content>
 
 </runtime>

repos/dde_bsd/run/audio_in.run

@@ -57,6 +57,7 @@ append_platform_drv_config
 
 append config {
 	<start name="audio_drv">
+		<binary name="} [audio_drv_binary] {"/>
 		<resource name="RAM" quantum="8M"/>
 		<provides>
 			<service name="Audio_out"/>
@@ -82,9 +83,11 @@ install_config $config
 #
 
 set boot_modules {
-	core ld.lib.so init timer audio_drv test-audio_in
+	core ld.lib.so init timer test-audio_in
 }
 
+append boot_modules [audio_drv_binary]
+
 append_platform_drv_boot_modules
 
 build_boot_image $boot_modules

repos/dde_bsd/src/drivers/audio/pci_audio_drv/target.mk

@@ -1,7 +1,9 @@
 REQUIRES = x86 pci
-TARGET   = audio_drv
+TARGET   = pci_audio_drv
 SRC_CC   = main.cc
 LIBS     = dde_bsd_audio dde_bsd_audio_pci base
 INC_DIR += $(REP_DIR)/include
 
+vpath %.cc $(REP_DIR)/src/drivers/audio
+
 CC_CXX_WARN_STRICT =