tpm_tis_spi: add missing attpm20p SPI device ID entry

"atmel,attpm20p" DT compatible is missing its SPI device ID entry, not
allowing module autoloading and leading to the following message:

"SPI driver tpm_tis_spi has no spi_device_id for atmel,attpm20p"

Based on:
commit 7eba41fe8c7b ("tpm_tis_spi: Add missing SPI ID")

Fix this by adding the corresponding "attpm20p" spi_device_id entry.

Fixes: 3c45308c44ed ("tpm_tis_spi: Add compatible string atmel,attpm20p")
Cc: [e-mail] # +v6.9
Signed-off-by: Vitor Soares <[e-mail]>
Reviewed-by: Lukas Wunner <[e-mail]>
Signed-off-by: Jarkko Sakkinen <[e-mail]>

drivers/char/tpm/tpm_tis_spi_main.c

···
 }
 
 static const struct spi_device_id tpm_tis_spi_id[] = {
+	{ "attpm20p", (unsigned long)tpm_tis_spi_probe },
 	{ "st33htpm-spi", (unsigned long)tpm_tis_spi_probe },
 	{ "slb9670", (unsigned long)tpm_tis_spi_probe },
 	{ "tpm_tis_spi", (unsigned long)tpm_tis_spi_probe },