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Add mixer control support for the Focusrite Forte (USB ID 0x1235:0x8010), an older USB audio interface that predates the Scarlett 2nd generation. The Forte uses UAC2_CS_MEM (bRequest=0x03) for its input controls rather than the standard UAC2_CS_CUR (0x01) used by Scarlett devices. This patch adds Forte-specific control handlers that use the correct USB protocol. Features implemented: - Input source selection (Mic/Line/Inst) for both channels - High pass filter switch - 48V phantom power switch - Phase invert switch - Pad switch - Preamp gain control (0-42 range, ~0-75dB) - Matrix mixer controls (6 inputs x 4 outputs) - Output volume and mute controls The device is registered via mixer_quirks.c and uses the existing mixer_scarlett.c infrastructure with Forte-specific additions. Credit: This work builds on prior reverse-engineering by alastair-dm. Link: https://github.com/alastair-dm/forte-mixer/wiki Link: https://github.com/alastair-dm/forte-mixer Link: https://github.com/jopdorp/forte-mixer Signed-off-by: Jegor van Opdorp <jegorvanopdorp@gmail.com> Link: https://patch.msgid.link/20260127081541.219669-1-jegorvanopdorp@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de>