ALSA: emu10k1: make mixer control mass creation less wasteful

Define arrays of strings instead of snd_kcontrol_new.

While at it, move the E-MU source & destination enum defs next to their
hardware defs, which is a lot more logical and will come in handy in a
followup commit. And add some static asserts to verify that the array
sizes match.

This also applies the compactization from the previous commit to the
destination registers.
While reshuffling the arrays anyway, switch the order of the HAMOA_DAC
& HANA_SPDIF output destinations for the 1010 card, so they follow a
more regular pattern. This should have no functional impact.

The code is somewhat de-duplicated by the extraction of add_ctls().
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230516093612.3536508-4-oswald.buddenhagen@gmx.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/emu10k1.h

@@ -1195,7 +1195,7 @@ SUB_REG_NC(A_EHC, A_I2S_CAPTURE_RATE, 0x00000e00)  /* This sets the capture PCM
  * physical outputs of Hana, or outputs going to Alice2/Tina for capture -
  * 16 x EMU_DST_ALICE2_EMU32_X (2x on rev2 boards). Which data is fed into
  * a channel depends on the mixer control setting for each destination - see
- * emumixer.c - snd_emu1010_output_enum_ctls[], snd_emu1010_input_enum_ctls[]
+ * the register arrays in emumixer.c.
  */
 #define EMU_DST_ALICE2_EMU32_0	0x000f	/* 16 EMU32 channels to Alice2 +0 to +0xf */
 					/* This channel is delayed by one sample. */