DSPHLE: Add Desert Bus libasnd ucode variants

[Pokechu22]

The Desert Bus homebrew uses custom libasnd DSP ucode. Specifically, v1.0.4 and v1.0.5 are modified versions of the ucode that was added to the libogc repo in devkitPro/libogc@b1b8eca (although the binary that was added in that commit does not match the code, and a matching binary only started being used in 2020 - see #10763 for my other notes). That libogc patch is attributed to the author of the homebrew, for what it's worth.

The difference between the libogc code and v1.0.4 is this, which swaps the left and right channels for stereo audio:

diff --git a/dsp_mixer.s b/dsp_mixer_desert_bus_v1.0.4.s
index 3b52614..9de5b84 100644
--- a/dsp_mixer.s
+++ b/dsp_mixer_v1.0.4.s
@@ -834,10 +834,10 @@ stereo_8bits:
        lrri $ACL0, @$AR2
        mrr  $ACM0, $ACL0
        andi $ACM0, #0xff00
-       mrr  $AXH1, $ACM0
+       mrr  $AXH0, $ACM0
        lsl  $ACC0, #8

-       mrr  $AXH0, $ACL0
+       mrr  $AXH1, $ACL0
        jmp     out_samp

 mono_16bits:
@@ -852,8 +852,8 @@ stereo_16bits:

 // 16 bits stereo

-       lrri $AXH1, @$AR2
        lrri $AXH0, @$AR2
+       lrri $AXH1, @$AR2
        jmp     out_samp

 mono_8bits_unsigned:
@@ -892,10 +892,10 @@ stereo_8bits_unsigned:
        xori $ACM0, #0x8080 // convert unsigned->signed
        mrr  $ACL0, $ACM0
        andi $ACM0, #0xff00
-       mrr  $AXH1, $ACM0
+       mrr  $AXH0, $ACM0
        lsl  $ACC0, #8

-       mrr  $AXH0, $ACL0
+       mrr  $AXH1, $ACL0
        jmp     out_samp

 stereo_16bits_le:
@@ -908,8 +908,8 @@ stereo_16bits_le:
        lsl  $ACC1, #8 // byteswap
        lsl  $ACC0, #8

-       mrr  $AXH1, $ACM1
-       mrr  $AXH0, $ACM0
+       mrr  $AXH0, $ACM1
+       mrr  $AXH1, $ACM0
        //jmp   out_samp

 out_samp:

The difference between v1.0.4 and v1.0.5 is this:

diff --git a/dsp_mixer_desert_bus_v1.0.4.s b/dsp_mixer_desert_bus_v1.0.5.s
index 9de5b84..9f5d428 100644
--- a/dsp_mixer_desert_bus_v1.0.4.s
+++ b/dsp_mixer_desert_bus_v1.0.5.s
@@ -190,6 +190,14 @@ MEM_SND:	equ	data_end ; it need 2048 words (4096 bytes)
 	jmp	exception6
 	jmp	exception7
 
+	; decodes as sbclr #0x04
+	; (note that sbclr has unused/ignored bits currently, and the canon version would be 1204)
+	cw 0x1234
+	; decodes as subr'l $ACC0, $AX1.H : $AC1.M, @$AR0
+	cw 0x5678
+	; decodes as bloopi #0x11, 0x2222
+	cw 0x1111
+	cw 0x2222
 	lri     $CONFIG, #0xff
 	lri	$SR,#0
 	s16         

v1.0.0 and v1.0.3 seem to be lost. They would have originally existed at https://wiibrew.org/wiki/Media:Desertbus.zip but this was not archived; both versions were uploaded to this location.

This change does not impact desert bus booting; see #11350 for that. I'm creating a separate PR so that it can be reviewed faster.

[lioncash]

One minor nit, but looks good overall